CS 381 Fall 2012
Assignment 5

Assignment 5 is due at 5 p.m. Monday, October 29. It is worth 20 points.

Procedures

E-mail answers to the exercises below to ggchappell@alaska.edu, using the subject “GA5”.

• Your answers should consist of the source code for the application and shaders for Exercise A. These should be attached to your e-mail message.
• Send only the above! I do not want project files or executables. I also do not want things I already have, like glut.h.
• Be sure to include your name in your e-mail.
• I may not read your homework e-mail immediately. If you wish to discuss the assignment (or anything else) with me, send me a separate message with a different subject line.

Working in Pairs

This assignment may optionally be done in pairs. If you work with someone else:

• Put both names in the submission e-mail and in the source code files.
• Cc: the submission e-mail to the other student, so that I can send an acknowledgement to both.
• Under normal circumstances, both authors will receive the same grade.

Exercises (20 pts total)

Exercise A — 3-D with Shaders, Facet Normals, Lighting

Purpose

In this exercise, you will write an OpenGL/GLUT application and associated shaders in GLSL. Your program will do lighting and compute facet normals.

Instructions

Write an OpenGL program and associated GLSL shaders that meet the following requirements.

• You must include at least one vertex shader and one fragment shader.
• At least one of your shaders must do lighting computations.
• Your application must compute at least one facet normal from vertex coordinates, and make use of it in an appropriate way (for lighting, probably).
  • Hint: a good idea is to write a function that is given three vertices and draws a triangle with the appropriate normal, then use this function repeatedly in your display callback.
• Other requirements are as for previous 3-D assignments (C or C++, OpenGL/GLUT, rules for callbacks, interactive animation, double buffering, 3-D, HSR, perspective, using model/view, original content).

Notes

• “Lighting” means something at least at the level of the Lambertian model.
• Standards for code are as for the first assignment (must compile, readable, following conventions, avoid extra output, clear how program is used, not buggy-looking, give credit, etc.).
• Some of you wrote some very nice programs for Assignment 4, and some of those programs could have used lighting. Here is your chance.
• Submitted code may be demonstrated in class.